Ellie, an orphan girl, is taken to the Saint Catherine Institute after being rescued from a satanic ritual. This secret institution, hidden behind the facade of a convent, trains young survivors of exorcisms and possessions to fight evil. Only a few students pass the final test: blindly choosing a cursed object and eradicating the evil within it. Failure can mean death or worse. The demons that haunt Ellie will find new opportunities to resurface.